Reenforced column



y 17,.1932- F. c. LANGENBERG ET AL 1,853,512

REENFORCED C OLUMN Filed D90. 21, 1926 INvEN-l-m vs:

Patented May 17, 1932 UNITED STATES PATENT OFFICE FREDERICK C. LANGENBERG, F WATERTOWN, MASSACHUSETTS, AND GUSTAV A.

' REINHARDT, OF YOUNGSTOWN, OHIO nnnnroncnn COLUMN Application filed December 21, 1926. Serial No. 156,234.

Our invention relates to columns such as heretofore have been constructed by filling a piece of metal pipe with a suitable concrete mixture. Such columns have been very mexpensive and have been extensively used, particularly in dwelling and apartment house construction. It has been found, however, that when the load to be placed on the column reaches a certain amount, the size of the pipe must be such that the total cost exceeds the cost of an ordinary I-beam or other structural shape. Our present invention has for its object, a concrete column of the type mentioned which can be made to carry heavier loads and which will still retain the cheapness which has been the great merit of the composite column. The invention also includes a method of making the columns.

Referring now to the drawings.

In Fig. 1 is shown one form of skelp to be used in making columns embodying our invention.

Fig. 2 shows the skelp shown in Fig. 1

rolled in a cylindrical shape and welded to 7 form a column casing.

Fig. 3 is a cross section of the column casingzfilled with concrete in its finished form. ig. 4 shows a column casing having ribs on the outside.

Fig. 5 is a cross section of a skelp for a column casing having ribs on both sides.

Fig. 6 is a cross section ofa column made from the skelp shown in Fig. 5.

Referring to the drawings.

At 11 is shown a fiat plate or skelp on which are formed a series of ribs 12 which extend longitudinally of the plate. These ribs are placed at suitable intervals apart determined by the amount of strength desired to be given to the column. The ribs 12 may be formed on the skelp in any convenient way. Our preferred method of doing so is to weld them to the plate while the plate is still in flat condition. Another suitable method is to form the ribs when the skelp is rolled. The ribs may be formed on one side as shown in Fig. 1 or on both sides as shown in Fig. 5 and may I, also be on the side of the skelp which is to form the inside of the column as shown in Fig. 2'or on the outside of the column as shown in Fig. 4. After the skelp is formed with suitable ribs thereon we roll the skelp into cylindrical form as-shown in Fig. 2 and weld the same as shown at 13, thus forming a column casing having ribs extending lengthwise thereof. Thereafter the column casing is filled with concrete as shown at 14 in Fig. 3 and the column is ready for use.

By the means described, we are able to produce columns having strength far in excess of similar columns as heretofore constructed and which cost much less than strucilaurgl shapes capable of supporting an equal What we claim is:

The improved column comprising a cylindrical casing provided with ribs on the inside and outside thereof extending radially thereof and integrally united throughout its length, said column casing beingfilled with concrete. i In testimony whereof we afiix our signaures.

FREDERICK C. LANGENBERG. GUSTAV A. REINHARDT. 

